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I’ve been trying to track this issue for quite a bit of time. What seems to be a problem is stock EFHK content.
You may try to move the files away (make a backup!).
cvx5410.bgl (if using Orbx Vector)
The alternative is to download our modified file – cvx5410.bgl and replace it.
Look at the OBX54100 which has a lot of stock scenery objects placed all around. Each of them takes a draw call or more.